Sub-caliber assembly for firearms



Oct. 26, 1948. v. H. wALLENBr-:RG

SUB-CALIBER ASSEMBLY FOR FI-REARMS 4 Sheets-Sheet 1 Filed May 4, 1945JLM Oct. 26, 1948.

V. H. WALL ENBERG SUB-CALIBER ASSEMBLY FOR FIREARMS 4 Sheets-Sheet 2Filed May 4, 1945 Oct. 26, 1948- v. H. WALLENBERG SUB-CALIBER ASSEMBLYFOR FIREARMS 4 Sheets-Sheet 5 Filed May 4, 1945 oct. 26, 1948. V `HWALLEBERG i 2,452,510

SUB-CALIBER ASSEMBLY FOR FIREARMS Filed May 4, 1945 4 Sheets-Sheet 4Patented Oct. 26, 1948 UNITED STATES PATENT Application May 4, 1945,Serial No. 591,948 In Sweden April 28, 1944 (Cl. L12-19) 31 Claims.

The present invention relates to nre-arms, and particularly to militaryrifles for shooting .with miniature ammunition by means of an insertionbarrel adapted to be inserted from the rear into the barrel of the rie.The primary object of the invention is to provide means which renderpossible ring of several rounds without recharging by means of miniatureammunition, in a manner such that the hand motions required for therecharge movements of military rifles will be maintained as much aspossible. In order to shoot with miniature ammunition, certain parts vofa normal military rifle, that is the bolt, the floor-plate of themagazine and the appertaining magazine spring and follower, areexchanged for certain appropriate members. These members can be insertedand removed by simple hand movements.

The diculties in [firing several rounds Without recharging withminiature ammunition in a usual military rifle or similar nre-arm aremainly due to the unanged and inconveniently shaped min.. iatureammunition the shape of which is a result of the Arequirements for thecheap method of manufacture. Due to the shape and the small size oi theminiature ammunition, extraction and ejection become difficult problems.Also the feeding of the cartridges from a strip or clip to the cartridgechamber is connected with diiculties if the cartridges are notpositively guided during their entire feeding movements. Such guidingmeans are, however, diiiicult to realize.

It is a further object of the invention to provide a mechanism for thepurpose indicated, in which neither extractors nor ejectors are neededand in which the cartridges may in advance be inserted into cartridgechambers which are successively brought into firing position.

These and further objects I attain by mechanism illustrated in theaccompanying drawings in which:

Fig. 1 is a vertical section through the breech mechanism withappertaining parts of a military rie of the Mauser type; Fig. 1a is avertical section through the breech mechanism according to an embodimentof the invention with the various parts in the positions immediatelyafter rng; Fig. 2 is a similar section with the parts in a positionduring the last part of the back movement of the bolt; Fig. 3illustrates part of the novel device as viewed from below in theposition according to Fig. 1a; Fig. 4 is a section on an enlarged scaleof the bolt along the line IV, Fig. la; Fig. 5 is a section through thebolt along the line V inA Fig. la; Fig. 6 illustrates the bolt as viewedfrom above in Fig. la; Fig. 7 is a somewhat modified embodiment of thebolt; Fig. 8 is a vertical section of a slightly modified embodiment ofthe invention; Fig. 9 is a section taken substantially on the lineIX-IX, Fig. 8; Fig 10 is an enlarged section through part of the breechmechanism along the line X-X, Fig. 2; and Fig. 1l shows a modiiicationof some parts shown in Fig. la.

Referring to Fig. 1, numeral l denotes the rear portion of the riflebarrel which is threaded into the bolt case 2. The bolt a is in usualmanner connected with the bolt handle b and is combined with the guidesleeve c and .provided with the striker d, striker nut e, cooking piecef and striker spring g. The normal magazine case m is closed at thebottom by the door-plate h, and contains magazine spring z' and follower7c. It is deemed unnecessary to describe further details of the riiie,as such details are well known in the art and are not affected by theexchange required for shooting with miniature ammunition.

For shooting with miniature ammunition, the parts denoted by letters ato k, that is, the bolt and magazine spring with appertaining parts, areto be exchanged for devices to be described with reference to Fig. la.

Referring to Fig. 1a, numeral l again denotes the rear .portion of therifle barrel which is threaded into the bolt case 2. Into the bolt case,there is inserted a tube 3 in which the substitute bolt 4 is movable,The insertion barrel 5 for shooting with miniature ammunition is at itsrear end located within the bolt cover, said rear end being surroundedby the tube 3. The inserted ybarrel 5 may be detachably connected withthe tube 3, such as by means of a bayonet-clutch joint, shown in Fig.11, in order to facilitate withdrawal of the insertion barrel from therie barrel. T-o this end, the tube 3 has Aa radial internal projection52 adapted to engage a groove in the insertion bar-rel 5, said groovehaving an axial portion 53 and an adjoining portion 54 extendingobliquely rearwardly. The tube 3 which at its lower portion is providedwith an axial opening 6 is externally connected with a guide bar 'l(Figs. 3-5 and 10) which engages the normal axial guide groove 5l (Figs.9 and l0) in the bolt case so as to prevent turning movement of thetube. The tube 3 is prevented from moving rearwardly due to the factthat the rear end 55 of the guide bar 'l abuts against a bolt stop 5S(Fig. 10) normally located on the left hand side of the rifle, whichbolt stop is mounted on a pin 58 and adapted to be swung out against theaction of a spring 5l. When the comes into contact with the lower faceof th'e insertion barrel 5. Upon continued rotation oi the magazine 2l'by means of the catch, the cartridge chamber 29 will trail along theinsertion barrel, and, at the same time, the magazine together with theaXle 26 and the magazine carrier 2li will be swung downwardly andbackwardly about the pivot 2l, and the spring t2 will be compressed.Fig. 2 illustrates a position in which the cartridge chamber 29 is readyto get out ci contact with the insertion barrel. During the last portionoi the backward movement of the bolt from the position shown in Fig. 2to the position in which' the lever l1 abuts against the wall 53, thespringv 22 forces the magazine carrier fill and thus also the magazinein an upward and forward direction about the pivot 2l. Consequently, thecartridge chamber 29 will enter the space between the bolt and theinsertion barrel. Excessive rotational movement of the magazine due toits inertia is prevented, on

the one hand, due to the fact that the next cartridge chamber il? willtrail alor. the insertion barrel so as to brake the rotational movementoi the magazine, and, on the other hand, due to the fact that the nextpin 323 will come into contact with the abutment 3Q on the forward nger38 of the catch. To the same end, the catch fili may be arranged in amanner such that it resiliently abuts against the rotatable magazine soas to brake the rotational movement thereof. After the movementsdescribed, the magazine 2l has been rotated in an anti-clockwisedirection through an angle which is somewhat greater than the angulardistance between two consecutive cartridge chambers. l

If, thereupon, the bolt il is again moved forth into its lockingposition, the pin 33 located bee tween the fingers 3i and 33 will comeinto contact with the abutment dll of the catch which will be moved in aforward direction. by means of the bolt-actuated lever il'.Consequently, the magazine will be rotated through a small angle. As aresult of this rotation, the cartridge chamber 29 will be moved towardsthe rear end of the insertion barrel, whereupon it will be forcedagainst the mouth of the barrel by means of th'e bolt. When the bolt hasbeen moved into its locked position, the striker spring l2 has been'comn pressed in the usual manner, and the cartridge housed in th'ecartridge chamber 29 can be red o. The recharging movement described isthen repeated, until all of the cartridges have been red oii In order toinsert new cartridges, the spring 23 is withdrawn from the opening 2d,whereupon the magazine carrier 2i! can be swung out from the magazinespace together with the rotatable magazine 2l. Thereupon, the cartridgecases still contained in the cartridge chambers can be re movedtherefrom and exchanged for new cartridges, or the rotatable magazinecan be removed together with the cartridge cases and substituted by anew magazine already charged with car-- tridges. The magazine carrier 2Bis then again swung into the magazine space, and the spring 23 isintroduced into the opening 2li. During the recharging operation, thecatch 3d is, by means of the spring il i, maintained in 4a positionsuitable to the insertion of the rotatable magazine.

According to the modied embodiment of the bolt shown in Fig. 7, theaxial groove Mo is entirely separated from the groove l and merges in aperipheral groove lab. n this instance, the

groove l5 is only intended for cooperation with the lever Il, whereasthe grooves Ma and lab co- 6 operate with the locking member l d which',in this case, is assumed to be disposed towards the left into a positionregistering with the groove Mb. Due to this arrangement, the bolt isreliably guided even in its rearward end position in which the handle I3is in an upright position.

The cartridge chambers may be slightly oval or conical or they may beprovided with projections, in order'that the cartridges during therecharging movements shall be safely retained in their respectivecartridge chambers due to slight deformations.

In Figs. 8 and 9, there is sh'own a slightly modi fled construction ofthe insertion barrel 5. In this instance, the tube 3 is secured inproper posi tion by means of a helical spring 45 inserted between theforward end of the tube 3 and a shoulder it on the insertion barrel, bymeans of which said barrel abuts against the rear end of the rie barrell. The spring lil forces the guide bar of the tube 3 against the boltstop 56 of the rifle and thus prevents lost motion of the tube andinsertion barrel. The insertion barrel has a number of radial grooves4'.' spaced peripherally from each other. A pin d8 having a head i8 isadapted to engage either of the grooves il. The head i8 is axiallyslidably in the guide groove 5I of the bolt case. The tube and bolt canbe inserted and withdrawn together with the insertion barrel, since thetube and barrel are interconnected by means of the pin d8 and since thespring 45 axially acts upon the head G9 and thus maintains the pin d8 inengagement with one of the grooves lll.

Due to small, practically unavoidable inaccuracies in the manufacture ofthe insertion barrel, it will in most cases be found that `the axis ofthe insertion barrel coincides with the aXis of the rifle barrel in acert-ain angular position of the inser etion barrel, while said axes areslightly deviating from each other in other angular positions of theinsertion barrel. The proper angular position can be easily found byinspecting the hits on the target. If the grooves fil are marl/:ed bynumerals or letters, it can thus be ascertained which of the numerals orletters corresponds to the proper angular position, andthe barrel canalways be inserted in that position.

From Fig. 8, it will further be seen ythat the catch 3G has a downwardlyextending portion 5E) near its pivot 35. Said portion 5G constitutes acert-ain mass or weight which counteracts any :tendency of the catch tobe entirely swung out of engagement with the pins 33 as a result of veryrapid rep-eating movements.

V/'hat I claim is:

l. A sub-caliber assembly for use in a 'bolt-action riile ofthe typeincluding a bolt, a bolt case, a fixed barrel secured to the bolt oase,and a magazine case, said assembly comprising; an insertion barrelconstructed and arranged to be at least partly inserted into the bore orsaid fixed barrel and `h-aving a smaller caliber than said ilzed barrel,a substitute bolt, a cartridge magazine, means constructed and arrangedto support said magazine in said magazine Case, said magazine having aplurality of cartridge chambers for cartridges, and means responsive tothe movement of said substitute bolt for bringing said cartridgechambers successively into firing position relative to said insertionbarrel.

2. A sub-caliber assembly for use in a bolt-action riiie of the typeincluding a bolt, a bolt case, a fix-ed barrel secure-d to the boltcase, and a magazine case, said assembly compri-sing; an insertionbarrel constructed and larranged to be at least having a plurlity ofcartridge chambers for cartridges, and means responsive to the movementof said substitute bolt for rotating said cartridge magazine, whereby tobring said cartridge chambers successively into firing position relativet said insertion barrel, said pivot being located downwardly andforwardly of said axle.

10. A sub-caliber` assembly for use in a boltaction rie of the typeincluding a bolt, a bolt case, a fixed barrel secured to the bolt case,and a magazine case open at the bottom, said assembly comprising; aninsertion barrel constructed and arranged to be at least partly insertedinto the bore of said xed barrel and having a smaller caliber than saidxed barrel, a substitute bolt, a magazine frame constructed and arrangedto be detachably fastened to the magazine case adjacent the bottomthereof, a pivot on said frame, a magazine carrier normally placed insaid magazine case and mounted on said pivot, an axle secured to saidmagazine carrier, a cartridge magazine rotatably mounted on said axleand having a plurality of cartridge chambers for cartridges, and meansresponsive to the movement of said substitute bolt for rotating saidcartridge magazine, whereby to bring said cartridge chamberssuccessively into ring posiiton relative to said insertion barrel, saidmagazine carrier being adapted to be swung out of, and into, saidmagazine case through said frame.

1l. A sub-caliber assembly for use in a boltaction rifle of the typeincluding a bolt, a bolt case, a nxed barrel secured to the bolt case,and a magazine case open at the bottom, said assembly comprising; aninsertion barrel constructed and arranged to be at least partly insertedinto the bore of said fixed barrel and having a smaller caliber thansaid fixed barrel, a substitute bolt, a magazine frame constructed andarranged to be detachably fastened to the magazine case adjacent thebottom thereof, a pivot on said frame, a magazine carrier normallyplaced in said magazine case and mounted on said pivot, an axle securedto said magazine carrier, a cartridge magazine rotatably mounted on saidaxle and having a plurality of cartridge chambers for cartridges,resilient means adapted to swing said magazine carrier towards said`insertion barrel, and means responsive to the movement of saidsubstitute bolt for rotating said cartridge magazine, whereby to bringsaid cartridge chambers successively into ring posit'on relative to saidinsertion barrel.

12. A sub-caliber assembly for use in a boltaction riiie of the typeincluding a bolt, a bolt case, a xed barrel secured to the bolt case,and a magazine case open at the botton, said assembly comprising; aninsertion barrel constructed and arranged to be at least partly insertedinto the bore of said xed barrel and having a smaller caliber than saidbarrel, a substitute bolt, a magazine frame constructed and arranged tobe detachably fastened to the magazine case adjacent the bottom thereof,a pivot on said frame, a magazine carrier normally placed in saidmagazine case and mounted on said pivot, an axle secured to saidmagazine carrier, a cartridge magazine rotatably mounted on said axleand having a plurality of cartridge chambers for cartridges, resilientmeans adapted to swing said magazine carrier toward said insertionbarrel, and means responsive to the movement of said substitute bolt forrotating said cartridge magazine, whereby to bring said cartridgechambers successively into firing position relative to said insertionbarrel, each of said cartridge chambers fil being adapted during itsmovement into firing position to trail along the lower face of saidinsertion barrel, whereby to swing said magazine and magazine carrieragainst the action of said resilient means.

13. A sub-caliber assembly for use in a boltaction rifle of the typeincluding a bolt, a bolt case, aflxed barrel secured to the bolt case,and a magazine case open at the bottom, said assembly comprising; aninsertion barrel constructed and arranged to be at least partly insertedinto the bore of said xed barrel and having a smaller caliber than saidxed barrel, a substitute bolt, a magazine frame constructed and arrangedto be detachably fastened to the magazine case adjacent the bottomthereof, a pivot on said frame, a magazine carrier normally placed insaid magazine case and mounted on said pivot, an axle secured to saidmagazine carrier, a, cartridge magazine rotatably mounted on said axleand having a plurality of cartridge chambers for cartridges, resilientmeans adapted to swing said magazine carrier towards said insertionbarrel, and means responsive to the movement of said substitute bolt forrotating said cartridge magazine, whereby `to bring said cartridgechambers successively into ring position relative to said insertionbarrel, said resilient means consisting of a spring wire wound aroundsaid pivot and having one of its ends secured to said magazine carrier,the other end of said spring wire being adapted to be detachably xed tosaid frame and to be used as a handle for swinging said magazine carrierout of said magazine case.

14. A sub-caliber assembly for use in a boltaction rifle of the typeincluding a bolt, a boltcase, a fixed barrel secured to the bolt case,and a magazine case open at the bottom, said assembly comprising; aninsertion barrel constructed and arranged to be at least partly insertedinto the bore of said fixed barrel and having a smaller caliber thansaid fixed barrel, a substitute'bolt, a magazine frame constructed andarranged to be detachably fastened to the magazine case adjacent thebottom thereof, a pivot on said frame, a magazine carrier normallyplaced in said magazine case and mounted on said pivot, an axle securedto said magazine carrier, a cartridge magazine rotatably mounted on saidaxle and having a plurality of cartridge chambers for cartridges, afirst spring adapted to swing said magazine carrier towards saidinsertion barrel, a plurality of projecting pins on said magazine, thenumber of said projecting pins being equal to the number of saidcartridge chambers, a catch member, a second spring adapted to bringsaid catch member into engagement with said projecting pins, and meansresponsive to the movement of said substitute bolt for actuating saidcatch member, whereby to impart rotational movement to said magazine andto bring said cartridge chambers successively into firing positionrelative to said insertion barrel.

15. A sub-caliber assembly for use in a boltaction rie of the typeincluding a bolt, a bolt case, a fixed barrel secured to the bolt case,and

a magazine case open at the bottom, said assembly comprising; aninsertion barrel constructed and arranged to be at least partly insertedinto the bore of said fixed barrel and having a smaller caliber thansaid xed barrel, a substitute bolt, a magazine frame constructed andarranged to be detachably fastened to the magazine case adjacent thebottom thereof, a pivot on said frame, a magazine carrier normallyplaced in said maga- `f zine'cas'e rand'mountedon said'pivot, any axle fsecuredt to" said magazine' carrier, r a ycartridgey f vmagazinerotatably mounted on said axle vand having" a plurality f of cartridgerchambers. for

meinben-fa second'springy adapted' to'bringrsaidcatchimemberintoengagement with said1pro`ject f i-ngp'ins, 's'aidrcatch'member being rpivotally mounted onV said arm,'an'dz saidarrnibeing coni nete'dfwith i said i substitute'y bolt and operable'upon movement thereof, rwhereby to'impart rot-ationalv4 movement tosaid-1 magazineandto ,bringr k f said' cartridge charnbers'vsuccessively into' firingy position relative tof said insertion barrel.

' I 16; Ay sub-caliber assembly yfor, use in a rbolt-r action rifler ofthe type including a bolt,A a bolt the bore oisaidr ixed barrel'and'Vhaving a smaller vcaliber than said'fixedbarrel; a' substitute bolt', fa` magazinel frame constructed and arranged to f ment,said"c`atoh memberbeing pivotally mounted Orr-said arm andadaptedfto impart arvlimiteclrotaticnalmovementtto ysaid magazine,y the bacio, f wardmovement or said army being limited by' the f rear 'Wallofsaid' magazineease,r whereby to limit they backwardr movement yofy saidrsubstitute,bolt, f

1S. A sub-caliber" assembly for use in a boltfactionr rifle of theY'type including a bolt, a bolt casefa iixedfbarrel secured tothefboltcase, and

a'lmagazine' vrcasel open' at the bottom, said assembly' comprising; an'insertion rbarrel constructed andV arranged to beat least partlyinserted into the? bore-of thenxe'd barrel and having a smaller caliberthan'said fixedv barrel, a substitutey bolt,

a magazineframe yconstructed and arranged toy be 'detachably fastened tothe magazine case adjacent they bottom'thereof, a, pivot on saidAtrame,y f a magazine carrier normally placed in` said magazine :oase andmounted on'y said pivot, an yaxle secured to rsaidy magazine carrier, acartridge f magazine?rotatably-y mounted on saidaxle and f case, e:.fixed barrell securedy tothe boltc'asei, and f -al magazine case'open.atfthe bottom, said assem-y bly comprising; Van ,insertion barrelconstructed' 'and arranged" to be ati least; partly inserted ,intov be'detachablyy fastenedto' the kmagazine case adf `jacent the bottomthereof, apivot onfsaid frame,y

a: magazine carrier normally placed in said iriag-r l yazinefcaseandmountedon said pivot,y an axler ysecured,tc'saidtmagazine'carrier,racartridgemagf f azine rotatably mounted on saidfa-xle and having f a"plurality of` 'cartridger chambers4 forcartridges, f y'arlrst springadapted tot swing'said yrrlagazine'y carrier towards said insertionbarrel,r` a Aplurality 'of projecting pins on said magazine, thenumberof said projecting pins being equal to thenumber 'offsaid' cartridgechambers',v a catch member, a second spring adapted to bring'saidcatchmem'- ber into engagement with said projecting pins, said substitutefbolt having a lrecessedl portion, and an' ,armipivotally' mountedA insaid frame and engaging Vsaidrecessed portion,y said catch mem' berbeingpivotal-1y mounted on said arm and adapted toimpart a. limitedrotational movement to said magazine.'

17.,'A sub-caliber assembly for use in a bolta-ction' rilie O'f the typeincluding a bolt,` a bolt case/,Ha xedf barrel s cured to'tliebolt'casc,ard a magazine ca'se Aopen at the'bottom, said assembly comprising; .aninsertion Vbarrel constructed and arranged to beat least'partly insertedinto the bore of said fixed barrelv and having asmaller cali-ber thansaid fixed' barrel, a substitute bolt, a magazine" frame constructedandv arranged to' be detachablyiastened toA the magazinev oase adjacentvthe bottonr thereof; a pivot on said frame', a magazine carrier normallyplaced in saidmagazine case and' mounted on said' pivot, Aan axlesecured to said magazine carrier, a cartri'dgez'n'ag'- azine rotatablymounted on said axle and having aplurality of cartridge chambers forcartridges, av rst 4spring adaptedto' swing said magazine carriertowards-.said insertion zba'rrel', a plurality l of :projecting pins onfsaid magazine', the number Of said projecting'pins being equal tothenumber of saidfcartridge channbers',l a catch member, a second springadapted to'brin'g said* catch meme b'eriintof engagement with saidprojecting pins', saidsubstitute bolt-having a recessed portion, and anarm' pivo-talfly mounted on `said frame" and adapted4 to` engagesaid'recessed portioa'n'd to perform a' forward and backward swinging :nove-Ylhaving a vplurality of cartridge ychambers yfory cartridg'eaanrstspring adapted tor swing said 'magazine rcarrier towards'r saidinsertion barrel, f

a plurality of projecting 'pins on said magazine,r y f ythe number of:said projecting rpins, being equal f tothe number of said cartridgechambers, a catch member, second spring adapted to bring saidy f catchmember i'n'to engagement with said projectying pins, said substitute'bolt having a recessedr portion, and anarm" pivotallyr mounted on saidyyiframe and adapted to' engage said recessed pory tonuandj toperform aiomvardy and backward rswinging movement, said catch ymember being',rpivota-llymounted yon saidy arm and adapted to -f in'mart-y a; limitedrotationaly movement to said i magazine, the*lrnaokvwar'dr movement ofsaid rarm v being, limited by 'ffhe rear yWall of sadmagazine case',whereby ,toy limit the backward i movement of said substitute bolt,ysaid second springy being f further adapted' to nieve saidvarm into itsback* f Ward end position.

19. A sub-caliber assembly for use in a boltaction rifle of the typeVincluding a bolt, a bolt case, a xed barrel secured to the bolt case,and a magazine case, said assembly comprising; an insertion barrelconstructedv and arranged'to be at least partly inserted into the boreof the fixed barrel and having a smaller caliber than said fixed barrel,a substitute bolt, a rotatable cartridgemagazine, means constructed andarrange to support said magazine in said magazinev case, said magazinehave a plurality of peripherally spaced cartridge chambers and acorresponding number of projecting pins, a catch member having a irontn'ger and a rear nger adapted successi'vely to'vcooperate With saidprojecting pins to impart limited rotational movement to said magaz'ine'whereby tobring said cartridge chambers successively into ring positionrelative to said insertion barrel, and means for transmitting movementfrom said substitute bolt to said catch member.

201A sub-caliber' assembly for use in a boltaction rifle of the typeincluding a bolt, a bolt case, a iixe'd barrel secured to the bolt case,and a magazine case, said assembly' comprising; an insertion barrelconstructed and arranged to be at `least partly insertedl into the boreof said fixed barreland having' a smaller caliber than said xed barrel,a substitute bolt, a rotatable cartridge magazine, mean-s constructedand arranged to supportfs'aid magazine in said magazine case, saidmagazine having Ya lplurality of peripherally spaced cartridge chan'bersand a corresponding number of projecting pins, a catch member having airont finger and a rear finger adapted successively to cooperate withsaid projecting pins to impart limited rotational movement to saidmagazine whereby to bring said cartridge chambers successively into ringposition relative to said insertion barrel, and means for transmittingmovement from said substitute bolt to said catch member, said frontfinger being adapted during the backward movement or -said substitutebolt to engage one of said projecting pins so as to rotate said magazinethrough an angle somewhat greater than the angular clistance between twoconsecutive cartridge chambers.

21. A rifle as claimed in claim 20 and in which said front nger has afront abutment adapted upon angular movement of said magazine to comeinto contact with the next projecting pin in the series so as to preventexcessive rotational movement of said magazine due to the inertiathereof.

22. A sub-caliber assembly for use in a boltaction riiie of the typeincluding a bolt, a bolt case, a fixed barrel secured to the bolt case,and a magazine case, said assembly comprising; an insertion barrelconstructed and arranged to be at least partly inserted into the bore ofsaid fixed barrel and having a smaller caliber than said fixed barrel, asubstitute bolt, a rotatable cartridge magazine, means constructed andarranged to support said magazine in said magazine case, said magazinehaving a plurality of peripherally spaced cartridge chambers and acorresponding number of projecting pins, a catch member having a frontlinger and a rear linger adapted successively to cooperate With saidprojecting pins to impart limited rotational movement to said magazinewhereby to bring said cartridge chambers successively into firingposition relative to said insertion barrel, and means for transmittingmovement from said substitute bolt to said catch member, said rearfinger having a front abutment adapted during the beginning of theforward movement of said substitute bolt to move a cartridge chambertowards the rear end of said insertion barrel, said substitute boltbeing adapted to force said cartridge chamber nally into contact withsaid insertion barrel.

23. A sub-caliber assembly for use in a boltaction rifle of the typeincluding a bolt, a bolt case, a iixed barrel secured to the bolt case,and a magazine case, said assembly comprising; an insertion barrelconstructed and arranged to be at least partly inserted into the bore ofthe xed barrel and having a smaller caliber than said iixed barrel, atubular member insertable into the bolt case, a substitute bolt slidablewithin said tubular member, a rotatable cartridge magazine, meansconstructed and arranged to support said magazine in said magazine case,said magazine having a plurality of cartridge chambers, a catch memberadapted to engage said magazine for imparting limited rotationalmovement thereto, a recessed portion in said substitute bolt, and apivotally mounted arm projecting into said recessed portion, said catchmember being pivotally mounted on said arm, and said tubular memberhaving an axial o-pening for said arm, catch member and magazine.

24. A sub-caliber assembly for use in a boltaction rifle of the typeincluding a bolt, a bolt case having an axial guide groove, a Xed barrelsecured to the bolt case, and a magazine case, said assembly comprising;an insertion barrel constructed and arranged to be at least partly toIinserted into the bore of said xed barrel and having a smaller caliberthan said i'ixed barrel, a tubular member insertable into the bolt case,a substitute bolt'slidable within said tubular member, a rotatablecartridge magazine, means constructed and arranged to support saidmagazine in said magazine case, said magazine having a plurality ofcartridge chambers, a catch member adapted to engage said magazine forimparting limited rotational movement thereto, a recessed portion insaid substitute bolt, a pivotally mounted arm projecting into saidrecessed portion, said catch member being pivotally mounted on said arm,and a guide bar secured to said tubular member and adapted to engagesaid guide groove to prevent turning movement of said tubular member.

25. A sub-caliber assembly for use in a boltaction rifle of the typeincluding a bolt, a bolt case having an axial guide groove, a bolt stopmember, a xed barrel secured to the bolt case, anda magazine ease, saidassembly comprising; an insertion barrel constructed and arranged to beat least partly inserted into the bore of said xed barrel and having asmaller caliber than said xed barrel, a tubular member insertable intothe bolt case, a substitute bolt slidable within said tubular member, arotatable cartridge magazine` means constructed and arranged to supportsaid magazine in said magazine case, said magazine having a plurality ofcartridge chambers, a catch member adapted to engage said magazine forimparting limited rotational movement thereto, a recessed portion insaid substitute bolt, a pivotally mounted arm projecting into saidrecessed portion, said catch member being pivotally mounted on said arm,and a guide bar secured to said tubular member and adapted to engagesaid guide groove to prevent turning movement of said tubular member,said guide bar being adapted to abut against said bolt stop member toprevent backward movement of said tubular member.

26. A sub-caliber assembly for use in a boltaction rifle of the typeincluding a bolt, a bolt case having an axial guide groove, a fixedbarrel secured to the lbolt oase, and a magazine case, said assemblycomprising; an insertion barrel constructed and arranged to be at leastpartly inserted into the bore of said fixed barrel and having a smallercaliber than said ixed barrel, a tubular member insertable into the boltcase, guiding means on said tubular member cooperative with said guidegroove, a substitute bolt slidable within said tubular member, arotatable cartridge magazine, means constructed and arranged to supportsaid magazine in said magazine case, said magazine having a plurality ofcartridge chambers, means responsive to the movement oi said substitutebolt for bringing said cartridge chambers successively into ringposition relative to said insertion barrel, and means for connectingsaid insertion barrel with said tubular member.

27. A sub-caliber assembly for use in a boltaction rifle of the typeincluding a bolt, a bolt case having an axial guide groove, a xed barrelsecured to the bolt case, and a magazine case, said assembly comprising;an insertion barrel constructed and arranged to be at least partlyinserted into the bore of said xed barrel and having a smaller caliberthan said fixed barrel, a tubular member insertable into the bolt case,guiding means on said tubular member cooperative With said guide groove,a substitute bolt slidable within said tubular member, a rotatablecsrtrid'ge magazine, meansl constructed and' arranged to support saidmagazine in said magazine said magazine having a plurality of cartridchambers, means responsive to the movement oi, said substituted bolt forbringing said` cartridge chambers successively into firing positionreative to said insertion barrel, means for connecting said insertionbarrel concentrically With said tubular member, and means for adjustingsaid insertion barrel in a certain angular position relative tctubularmember.

2&3. A sub-caliber assembly for use in a boltaction rifle of the typeincluding a bolt, a bolt case having an aXial guide groove. a Xed'barrel secured to the bolt case, and a magazine case. said assemblycomprising; an insertion ba constructed and arranged to be at leastparty inserted into the bore of said xed barrel having a smaller caliberthan said fixed barrei, a tubular member insertable into the boltguiding means on said tubular member cooperative with said guide groove,a substitute bolt slidable Within said tubular member, a rotatablecartridge magazine, means constructed and arranged to support saidmagazine in said magazine case, said magazine having a plurality ofcartridge chambers, means responsive to the movement of substitute boltfor bringing said cartridge chambers successively into ring positionrelative to said insertion barrel, and resilient means for connectingsaid insertion barrel with said tubular member, said resilient meansvcomprising a helical spring inserted betweensaid insertion barrel andsaid tubular member.

29. A sub-caliber assembly for use in a boltaction rifle of the typeincluding a bolt, a bolt case having an axial guide groove, a iixedbarrel secured to the bolt case, and a, magazine case, said assemblycomprising an insertion barrel constructed and arranged to be at leastpartly inserted into the bore of said Xed barrel and having a smallercaliber than said xed barrel, a tubular member insertable into the boltcase, guiding means on said tubular member cooperative with said guidegroove, a substitute bolt slidabley Within said tubular member, arotatable cartridge magazine, means constructed and arranged to supportsaid; magazine in said magazine case, said magazine having a pluralityof cartridge chambers, means responsive to the movement of saidsubstitute bolt for bringing said cartridge chambers successively intoiiring position relative to said insertion barrel, a locking membersecured to said tubular member, and a groove in said substitute bolt,said locking member being adapted to engage said groove for locking saidsubstitute bolt in firing position.

30. A sub-caliber assembly for use in a boltaction rifle of the typeincluding a belt, a bolt case having an axial guide groove, a iixedbarrel secured to the bolt case, and a magazine' case, said lsseinblycomprising an insertion kbarrel constructed and arranged to be at leastpartly ine" .ted into the bore of said iixed barrel and llavg smallercaiber than said fixed barrel, i flor member insertable into the boltcase,

1 means on said tubularmembercooperasaid guide groove, a substitute boltslidab'le Within said tubular member, arotatablecanA tridge magazine,means constructed and arranged to support said magazine in said magazinecase, said magazine having a plurality of cartridge chambers, meansresponsive to the movement of said substitute bolt for bringing saidcartridge chambers successively into ring position relative to saidinsertion barrel, a locking member secured to said tubular member and tosaid guiding means extending radially into said tubular member, and agroove in said substitute bolt, said locking member being adapted toengage said groove for locking said substitute bolt in iiring position.

A sub-caliber assembly for use in a boltaction riile of the typeincluding a bolt, a bolt case, a iixed barrel secured to said bolt caseand a magazine case, said assembly comprising; an insertion barrelconstructed and arranged to be at least partly inserted into the bore ofsaid Xed barrel and having a smaller caliber than said fixed barrel, atubular member insel-table in the bolt case, a substitute bolt slidableWithin said tubular member, a rotatable cartridge magazine, meansconstructed and arranged to support said magazine in said magazine case,said magazine having a plurality of cartridge chambers, a recessedportion in said substitute bolt, a pivotally mounted arm projecting intosaid recessed portion, a catch member for imparting a limited rotationalmovement to said magazine for bringing said cartridge chamberssuccessively into firing position relative to said insertion barrel,said catch member l: ing pivotally mounted on said arm, and a lockingmember secured to said tubular member and adapted to engage Saidrecessed portion, whereby to lock.l said substitute bolt in ringposition.

VICTOR HENRI VJALLENBERG.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 964,419 Giusto et a1. July 12,1910 2,156,9l4` Gaidos Mar. 2l, 1939 FOREIGN PATENTS Number Country Date216,270 Great Britain Jan. 31, 1924 513,262 Germany Nov. 25, 1930

